227 lines
8.7 KiB
C++
227 lines
8.7 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Contributed by: Luis Cortes (cortes@gatech.edu)
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*/
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// This script exercises global routing code in a mixed point-to-point
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// and csma/cd environment. We bring up and down interfaces and observe
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// the effect on global routing. We explicitly enable the attribute
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// to respond to interface events, so that routes are recomputed
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// automatically.
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//
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// Network topology
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//
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// n0
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// \ p-p
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// \ (shared csma/cd)
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// n2 -------------------------n3
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// / | |
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// / p-p n4 n5 ---------- n6
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// n1 p-p
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// | |
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// ----------------------------------------
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// p-p
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//
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// - at time 1 CBR/UDP flow from n1 to n6's IP address on the n5/n6 link
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// - at time 10, start similar flow from n1 to n6's address on the n1/n6 link
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//
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// Order of events
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// At pre-simulation time, configure global routes. Shortest path from
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// n1 to n6 is via the direct point-to-point link
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// At time 1s, start CBR traffic flow from n1 to n6
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// At time 2s, set the n1 point-to-point interface to down. Packets
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// will be diverted to the n1-n2-n5-n6 path
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// At time 4s, re-enable the n1/n6 interface to up. n1-n6 route restored.
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// At time 6s, set the n6-n1 point-to-point Ipv4 interface to down (note, this
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// keeps the point-to-point link "up" from n1's perspective). Traffic will
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// flow through the path n1-n2-n5-n6
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// At time 8s, bring the interface back up. Path n1-n6 is restored
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// At time 10s, stop the first flow.
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// At time 11s, start a new flow, but to n6's other IP address (the one
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// on the n1/n6 p2p link)
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// At time 12s, bring the n1 interface down between n1 and n6. Packets
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// will be diverted to the alternate path
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// At time 14s, re-enable the n1/n6 interface to up. This will change
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// routing back to n1-n6 since the interface up notification will cause
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// a new local interface route, at higher priority than global routing
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// At time 16s, stop the second flow.
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// - Tracing of queues and packet receptions to file "dynamic-global-routing.tr"
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#include <iostream>
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#include <fstream>
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#include <string>
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#include <cassert>
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#include "ns3/core-module.h"
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#include "ns3/network-module.h"
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#include "ns3/csma-module.h"
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#include "ns3/internet-module.h"
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#include "ns3/point-to-point-module.h"
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#include "ns3/applications-module.h"
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#include "ns3/ipv4-global-routing-helper.h"
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using namespace ns3;
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NS_LOG_COMPONENT_DEFINE ("DynamicGlobalRoutingExample");
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int
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main (int argc, char *argv[])
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{
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// The below value configures the default behavior of global routing.
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// By default, it is disabled. To respond to interface events, set to true
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Config::SetDefault ("ns3::Ipv4GlobalRouting::RespondToInterfaceEvents", BooleanValue (true));
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// Allow the user to override any of the defaults and the above
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// Bind ()s at run-time, via command-line arguments
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CommandLine cmd;
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cmd.Parse (argc, argv);
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NS_LOG_INFO ("Create nodes.");
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NodeContainer c;
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c.Create (7);
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NodeContainer n0n2 = NodeContainer (c.Get (0), c.Get (2));
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NodeContainer n1n2 = NodeContainer (c.Get (1), c.Get (2));
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NodeContainer n5n6 = NodeContainer (c.Get (5), c.Get (6));
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NodeContainer n1n6 = NodeContainer (c.Get (1), c.Get (6));
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NodeContainer n2345 = NodeContainer (c.Get (2), c.Get (3), c.Get (4), c.Get (5));
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InternetStackHelper internet;
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internet.Install (c);
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// We create the channels first without any IP addressing information
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NS_LOG_INFO ("Create channels.");
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PointToPointHelper p2p;
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p2p.SetDeviceAttribute ("DataRate", StringValue ("5Mbps"));
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p2p.SetChannelAttribute ("Delay", StringValue ("2ms"));
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NetDeviceContainer d0d2 = p2p.Install (n0n2);
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NetDeviceContainer d1d6 = p2p.Install (n1n6);
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NetDeviceContainer d1d2 = p2p.Install (n1n2);
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p2p.SetDeviceAttribute ("DataRate", StringValue ("1500kbps"));
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p2p.SetChannelAttribute ("Delay", StringValue ("10ms"));
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NetDeviceContainer d5d6 = p2p.Install (n5n6);
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// We create the channels first without any IP addressing information
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CsmaHelper csma;
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csma.SetChannelAttribute ("DataRate", StringValue ("5Mbps"));
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csma.SetChannelAttribute ("Delay", StringValue ("2ms"));
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NetDeviceContainer d2345 = csma.Install (n2345);
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// Later, we add IP addresses.
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NS_LOG_INFO ("Assign IP Addresses.");
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Ipv4AddressHelper ipv4;
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ipv4.SetBase ("10.1.1.0", "255.255.255.0");
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ipv4.Assign (d0d2);
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ipv4.SetBase ("10.1.2.0", "255.255.255.0");
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ipv4.Assign (d1d2);
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ipv4.SetBase ("10.1.3.0", "255.255.255.0");
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Ipv4InterfaceContainer i5i6 = ipv4.Assign (d5d6);
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ipv4.SetBase ("10.250.1.0", "255.255.255.0");
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ipv4.Assign (d2345);
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ipv4.SetBase ("172.16.1.0", "255.255.255.0");
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Ipv4InterfaceContainer i1i6 = ipv4.Assign (d1d6);
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// Create router nodes, initialize routing database and set up the routing
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// tables in the nodes.
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Ipv4GlobalRoutingHelper::PopulateRoutingTables ();
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// Create the OnOff application to send UDP datagrams of size
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// 210 bytes at a rate of 448 Kb/s
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NS_LOG_INFO ("Create Applications.");
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uint16_t port = 9; // Discard port (RFC 863)
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OnOffHelper onoff ("ns3::UdpSocketFactory",
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InetSocketAddress (i5i6.GetAddress (1), port));
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onoff.SetConstantRate (DataRate ("2kbps"));
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onoff.SetAttribute ("PacketSize", UintegerValue (50));
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ApplicationContainer apps = onoff.Install (c.Get (1));
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apps.Start (Seconds (1.0));
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apps.Stop (Seconds (10.0));
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// Create a second OnOff application to send UDP datagrams of size
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// 210 bytes at a rate of 448 Kb/s
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OnOffHelper onoff2 ("ns3::UdpSocketFactory",
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InetSocketAddress (i1i6.GetAddress (1), port));
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onoff2.SetAttribute ("OnTime", StringValue ("ns3::ConstantRandomVariable[Constant=1]"));
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onoff2.SetAttribute ("OffTime", StringValue ("ns3::ConstantRandomVariable[Constant=0]"));
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onoff2.SetAttribute ("DataRate", StringValue ("2kbps"));
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onoff2.SetAttribute ("PacketSize", UintegerValue (50));
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ApplicationContainer apps2 = onoff2.Install (c.Get (1));
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apps2.Start (Seconds (11.0));
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apps2.Stop (Seconds (16.0));
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// Create an optional packet sink to receive these packets
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PacketSinkHelper sink ("ns3::UdpSocketFactory",
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Address (InetSocketAddress (Ipv4Address::GetAny (), port)));
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apps = sink.Install (c.Get (6));
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apps.Start (Seconds (1.0));
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apps.Stop (Seconds (10.0));
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PacketSinkHelper sink2 ("ns3::UdpSocketFactory",
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Address (InetSocketAddress (Ipv4Address::GetAny (), port)));
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apps2 = sink2.Install (c.Get (6));
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apps2.Start (Seconds (11.0));
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apps2.Stop (Seconds (16.0));
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AsciiTraceHelper ascii;
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Ptr<OutputStreamWrapper> stream = ascii.CreateFileStream ("dynamic-global-routing.tr");
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p2p.EnableAsciiAll (stream);
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csma.EnableAsciiAll (stream);
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internet.EnableAsciiIpv4All (stream);
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p2p.EnablePcapAll ("dynamic-global-routing");
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csma.EnablePcapAll ("dynamic-global-routing", false);
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Ptr<Node> n1 = c.Get (1);
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Ptr<Ipv4> ipv41 = n1->GetObject<Ipv4> ();
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// The first ifIndex is 0 for loopback, then the first p2p is numbered 1,
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// then the next p2p is numbered 2
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uint32_t ipv4ifIndex1 = 2;
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Simulator::Schedule (Seconds (2),&Ipv4::SetDown,ipv41, ipv4ifIndex1);
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Simulator::Schedule (Seconds (4),&Ipv4::SetUp,ipv41, ipv4ifIndex1);
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Ptr<Node> n6 = c.Get (6);
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Ptr<Ipv4> ipv46 = n6->GetObject<Ipv4> ();
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// The first ifIndex is 0 for loopback, then the first p2p is numbered 1,
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// then the next p2p is numbered 2
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uint32_t ipv4ifIndex6 = 2;
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Simulator::Schedule (Seconds (6),&Ipv4::SetDown,ipv46, ipv4ifIndex6);
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Simulator::Schedule (Seconds (8),&Ipv4::SetUp,ipv46, ipv4ifIndex6);
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Simulator::Schedule (Seconds (12),&Ipv4::SetDown,ipv41, ipv4ifIndex1);
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Simulator::Schedule (Seconds (14),&Ipv4::SetUp,ipv41, ipv4ifIndex1);
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// Trace routing tables
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Ipv4GlobalRoutingHelper g;
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Ptr<OutputStreamWrapper> routingStream = Create<OutputStreamWrapper> ("dynamic-global-routing.routes", std::ios::out);
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g.PrintRoutingTableAllAt (Seconds (12), routingStream);
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NS_LOG_INFO ("Run Simulation.");
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Simulator::Run ();
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Simulator::Destroy ();
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NS_LOG_INFO ("Done.");
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}
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